dt-bindings: mediatek,mt6779-keypad: Update Mattijs' email address

Update Mattijs Korpershoek's email address to @kernel.org.

Signed-off-by: Mattijs Korpershoek <mkorpershoek@kernel.org>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20250428-keypad-email-v1-1-dde6ac76725b@kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Author: makohoek

Documentation/devicetree/bindings/input/mediatek,mt6779-keypad.yaml

@@ -7,7 +7,7 @@ $schema: http://devicetree.org/meta-schemas/core.yaml#
 title: Mediatek's Keypad Controller
 
 maintainers:
-  - Mattijs Korpershoek <mkorpershoek@baylibre.com>
+  - Mattijs Korpershoek <mkorpershoek@kernel.org>
 
 allOf:
   - $ref: /schemas/input/matrix-keymap.yaml#